Ceramic Tile Advice Forums - John Bridge Ceramic Tile

Welcome to John Bridge / Tile Your World, the friendliest DIY Forum on the Internet


Advertiser Directory
JohnBridge.com Home
Buy John Bridge's Books

Go Back   Ceramic Tile Advice Forums - John Bridge Ceramic Tile > Tile & Stone Forums > Tile Forum/Advice Board

Sponsors


Reply
Thread Tools Search this Thread
Unread 02-01-2020, 01:07 PM   #1
Randmfernandes
Registered User
 
Join Date: Feb 2020
Location: Canton OH
Posts: 3
Kerdi shower leak

Good day
We installed a DIY kerdi shower. We used kerdi membrane, the polystyrene pan, but built the curb from plywood. We did not cover the plywood with cement board. Only membrane. We took great care installing but still our shower developed a slow leak.

We had kerdi inspect. They said our problem was that we had not used cement backer board. They seemed to think that was the root of the problem.

I have now opened the tiles to see what is going on. It looks like the problem is an area where membrane is not properly bonded.

My question: can I fix this area by filling the gap with thinset and applying kerdi membrane / band or do we really need to rip out the curbs and replace with kerdi curb or apply cement backer board? How significant was this mistake we made. Any advice is appreciated.
Attached Images
   
__________________
Marle
Randmfernandes is offline   Reply With Quote
Sponsored Links
Unread 02-01-2020, 01:43 PM   #2
Davy
Moderator -- Mud Man
 
Davy's Avatar
 
Join Date: Jan 2003
Location: Princeton,Tx.- Dallas area
Posts: 32,246
Hi Marle, welcome.

First of all, do you have any left over tiles from this installation or can you get more to do the repairs with?

What's behind the Kerdi on the walls?

I'm not a Kerdi expert but I would remove the door and curb, that way the curb can be rebuilt back. Before doing any demo, take measurements so the curb can be built back exactly as it is now, that way the door will fit back.

Get the curb and Kerdi work done and do a flood test before setting any tiles back.

Others will be along to help.
__________________
Davy

www.davystephenstile.com
Davy is offline   Reply With Quote
Unread 02-01-2020, 01:54 PM   #3
Houston Remodeler
Pondering retirement daily

STAR Senior Contributor

 
Houston Remodeler's Avatar
 
Join Date: Oct 2009
Location: Houston Texas
Posts: 28,195
This isn't looking like it would be an easy repair as removing the tiles damages the kerdi.

As much as I hate to say it, this would qualify as a re-do. The hard part of any shower is the floor area, so the walls are the quicker, easier section to re-do.

When the glass was installed - was the kerdi membrane penetrated with fasteners?
__________________
Paul1

For when DIY isn't such a good idea...
Houston TX area Kitchen & Bath Remodeling


http://CabotAndRowe.com
Houston Remodeler is offline   Reply With Quote
Unread 02-01-2020, 01:58 PM   #4
Dchesky
Registered User
 
Join Date: Dec 2015
Posts: 16
Based on what I’ve learned about kerdi membrane, it cannot be directly applied to wood. It has to be either gypsum, cement board or some other suitable substrate. That is the problem. So unfortunately you will have to remove the curb entirely and reinstall a kerdi curb or build one with 2 x’s and cover with densglass, cement board or even 1/2” kerdi board. Use the band to waterproof all seams and screws in the curb and inside outside corners before tile.


Sent from my iPhone using Tapatalk
__________________
Dave
Dchesky is offline   Reply With Quote
Unread 02-01-2020, 02:05 PM   #5
Randmfernandes
Registered User
 
Join Date: Feb 2020
Location: Canton OH
Posts: 3
Thanks for reaponses so far. We have green board behind shower walls covered with membrane. We thought we isolated the leak, through testing, to the floor and corner around curb area where i pulled out tiles.

When we installed the shower walls/ door we did penetrate kerdi. We put silicon on the screws. Do you recommend an alternate method?

Thanks
__________________
Marle

Last edited by Randmfernandes; 02-01-2020 at 02:11 PM.
Randmfernandes is offline   Reply With Quote
Unread 02-01-2020, 02:15 PM   #6
Davy
Moderator -- Mud Man
 
Davy's Avatar
 
Join Date: Jan 2003
Location: Princeton,Tx.- Dallas area
Posts: 32,246
Try to answer any questions we have, it helps us help you. Any left over tiles?

I wouldn't say it's a redo at this point but could end up being that. I think it's worth trying to fix although the time needed might take as long as a redo.
__________________
Davy

www.davystephenstile.com
Davy is offline   Reply With Quote
Unread 02-01-2020, 02:29 PM   #7
Randmfernandes
Registered User
 
Join Date: Feb 2020
Location: Canton OH
Posts: 3
Sorry davy. Missed that one. Yes we have enough for a repair.
__________________
Marle
Randmfernandes is offline   Reply With Quote
Unread 02-01-2020, 02:36 PM   #8
Davy
Moderator -- Mud Man
 
Davy's Avatar
 
Join Date: Jan 2003
Location: Princeton,Tx.- Dallas area
Posts: 32,246
In that case, I'd try to repair it. I do think you'll have to remove more tiles on the wall in that area and hope the Kerdi isn't damaged in the process.
__________________
Davy

www.davystephenstile.com
Davy is offline   Reply With Quote
Unread 02-01-2020, 04:27 PM   #9
makethatkerdistick
Registered User
 
Join Date: Oct 2017
Location: North Texas
Posts: 881
To me, the Kerdi seams look awfully loose. Is there air under these areas, or is it an excess of thinset?

Regardless, if you are attempting a repair rather than a redo, I'd probably use Kerdifix to inject into those areas and smear across the seams to achieve a better seal. If you use thinset, you might end up with too much. This will keep wicking moisture. The Kerdi system only works properly if the thinset under the seams is applied thinly and has full coverage. And even then, it needs to dry out between uses. If there is too much wicking going on, then it'll essentially never get dry and keep slowly leaking.

If you have to remove strips of the Kerdi membrane, keep in mind that it will result in the fleece being torn off at least from one side of the membrane, thus making a potential bond to a fresh piece of Kerdi virtually impossible, at least with thinset. I am not sure if the Kerdifix will attach de-fleeced membrane to fresh membrane. It might. If that is a problem for you, you might want to ask Schluter about it.


The green board is also somewhat of a mistake, albeit a smaller one. Its surface is waxier than that of normal drywall, thus potentially diminishing the bond between it and the Kerdi. Regular drywall or cement board are a better choice.

Lastly, if you want absolute peace of mind, this would have to be redone properly, unfortunately. But by all means, give it a shot with the repair.
__________________
Wolfgang
makethatkerdistick is offline   Reply With Quote
Unread 02-01-2020, 06:51 PM   #10
Kman
Moderator
 
Kman's Avatar
 
Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
Posts: 11,285
Regarding the screws on the shower door, were any driven into the curb, or just the walls?
__________________
Kevin

The top ten reasons to procrastinate:

1.
Kman is online now   Reply With Quote
Unread 02-01-2020, 06:51 PM   #11
Kman
Moderator
 
Kman's Avatar
 
Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
Posts: 11,285
And in what order was the Kerdi installed, floor or walls first?
__________________
Kevin

The top ten reasons to procrastinate:

1.
Kman is online now   Reply With Quote
Unread 02-09-2020, 01:41 PM   #12
Tiger Mountain Tile Inc
Registered Muser
 
Tiger Mountain Tile Inc's Avatar
 
Join Date: Feb 2011
Location: Issaquah, Washington
Posts: 6,760
I agree with Wolfgang. If it's your shower and you want to try to fix it with as minimal impact as possible I would try the Kerdi fix route. Test it before covering it with tile but keep an eye on it from here on out.
__________________
Jim Upton
DIYTileGuy
Tiger Mountain Tile Inc is offline   Reply With Quote
Reply

Stonetooling.com   Tile-Assn.com   National Gypsum Permabase


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Kerdi Shower Leak or Shower Door Leak? cnap Tile Forum/Advice Board 20 07-15-2019 12:54 PM
Kerdi Shower leak test Fail Amatuer2015 Tile Forum/Advice Board 10 06-16-2015 05:08 PM
Leak in Kerdi shower bed? Richard317 Tile Forum/Advice Board 12 09-10-2008 10:31 PM
Leak testing of Kerdi shower peterd Tile Forum/Advice Board 3 04-28-2005 02:36 AM
Leak Testing a Kerdi Shower? Anthony Tile Forum/Advice Board 7 06-08-2004 02:29 PM


All times are GMT -6. The time now is 01:33 PM.


Sponsors

Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright 2018 John Bridge & Associates, LLC